What is a PCM on a Car?
While performing a bit of at-home vehicle maintenance, you may have seen mentions of something known as the “PCM.” Even with a pretty solid understanding of a car’s mechanical operations, you may not know what “PCM” stands for at first glance. In truth, though, the “powertrain control module” in your car might just be one of its most important components in practice.
As such, any enterprising DIY mechanic needs to learn more about their car’s PCM. At the same time, they should also learn about a component called the ECM and be able to differentiate it operationally from the PCM. This guide will help you learn about both of those components, as well as learn to identify the symptoms of a malfunctioning PCM or ECM.